Setting java boot classpath so that scala 2.10 works on gradle 7.2 (elastic#1800)

Gradle 7.2 broke scala 2.10 compilation. The problem seems to be that the java boot classpath jars are
no longer getting into the scala boot classpath. This commit sets it in two ways: (1) it is explicitly set it
in scalaCompileOptions.additionalParameters (to prevent the build from failing) and (2) it is set in options.bootstrapClasspath to prevent warnings from javac that its boot classpath is incompatible with
the source version.

Author: masseyke

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

spark/core/build.gradle

@@ -150,6 +150,8 @@ tasks.named("test").configure {
 
 // Set minimum compatibility and java home for compiler task
 tasks.withType(ScalaCompile) { ScalaCompile task ->
+    task.scalaCompileOptions.additionalParameters = ["-javabootclasspath", new File(project.ext.runtimeJavaHome, 'jre/lib/rt.jar').absolutePath]
+    task.options.bootstrapClasspath = layout.files(new File(project.ext.runtimeJavaHome, 'jre/lib/rt.jar'))
     task.sourceCompatibility = project.ext.minimumRuntimeVersion
     task.targetCompatibility = project.ext.minimumRuntimeVersion
     task.options.forkOptions.executable = new File(project.ext.runtimeJavaHome, 'bin/java').absolutePath

spark/sql-13/build.gradle

@@ -169,6 +169,8 @@ configurations.matching { it.name.contains('CompilerPlugin') == false }.all { Co
 }
 
 tasks.withType(ScalaCompile) { ScalaCompile task ->
+    task.scalaCompileOptions.additionalParameters = ["-javabootclasspath", new File(project.ext.runtimeJavaHome, 'jre/lib/rt.jar').absolutePath]
+    task.options.bootstrapClasspath = layout.files(new File(project.ext.runtimeJavaHome, 'jre/lib/rt.jar'))
     task.sourceCompatibility = project.ext.minimumRuntimeVersion
     task.targetCompatibility = project.ext.minimumRuntimeVersion
     task.options.forkOptions.executable = new File(project.ext.runtimeJavaHome, 'bin/java').absolutePath

spark/sql-20/build.gradle

@@ -189,6 +189,8 @@ configurations.matching{ it.name.contains('CompilerPlugin') == false }.all { Con
 }
 
 tasks.withType(ScalaCompile) { ScalaCompile task ->
+    task.scalaCompileOptions.additionalParameters = ["-javabootclasspath", new File(project.ext.runtimeJavaHome, 'jre/lib/rt.jar').absolutePath]
+    task.options.bootstrapClasspath = layout.files(new File(project.ext.runtimeJavaHome, 'jre/lib/rt.jar'))
     task.sourceCompatibility = project.ext.minimumRuntimeVersion
     task.targetCompatibility = project.ext.minimumRuntimeVersion
     task.options.forkOptions.executable = new File(project.ext.runtimeJavaHome, 'bin/java').absolutePath

spark/sql-30/build.gradle

@@ -172,6 +172,8 @@ configurations.matching{ it.name.contains('CompilerPlugin') == false }.all { Con
 }
 
 tasks.withType(ScalaCompile) { ScalaCompile task ->
+    task.scalaCompileOptions.additionalParameters = ["-javabootclasspath", new File(project.ext.runtimeJavaHome, 'jre/lib/rt.jar').absolutePath]
+    task.options.bootstrapClasspath = layout.files(new File(project.ext.runtimeJavaHome, 'jre/lib/rt.jar'))
     task.sourceCompatibility = project.ext.minimumRuntimeVersion
     task.targetCompatibility = project.ext.minimumRuntimeVersion
     task.options.forkOptions.executable = new File(project.ext.runtimeJavaHome, 'bin/java').absolutePath